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ECE :: Communication Systems

Communication Systems - Section 1
Communication Systems - Section 2
Communication Systems - Section 3
Communication Systems - Section 4
Communication Systems - Section 5
Communication Systems - Section 6
Communication Systems - Section 7
Communication Systems - Section 8
Communication Systems - Section 9
Communication Systems - Section 10
Communication Systems - Section 11
Communication Systems - Section 12
Communication Systems - Section 13
Communication Systems - Section 14
Communication Systems - Section 15
Communication Systems - Section 16
Communication Systems - Section 17
Communication Systems - Section 18
Communication Systems - Section 19
Communication Systems - Section 20
Communication Systems - Section 21
Communication Systems - Section 22
Communication Systems - Section 23
Communication Systems - Section 24
Communication Systems - Section 25
Communication Systems - section-26
Communication Systems - Section-27

  1. Some multiplexing arrangements for telephone system are

    1. Space multiplexing
    2. Time division multiplexing
    3. Frequency division multiplexing
    Which of the above allow transmission of many independent signals over a single channel?

    2. A.
    1 only
    B.
    2 and 3 only
    C.
    1, 2, 3
    D.
    1 and 3 only

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  2. Industrial noise has the frequency range of

    3. A.
    1 to 100 Hz
    B.
    200 to 5000 Hz
    C.
    above 200 MHz
    D.
    1 to 600 MHz

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  3. Thermal noise Power is

    4. A.
    proportional to bandwidth (B)
    B.
    ∝ B
    C.
    D.
    ∝B2

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  4. The characteristic impedance of coaxial cable is about

    5. A.
    1000 ohm
    B.
    500 ohm
    C.
    250 ohm
    D.
    75 ohm

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  5. The diameter and thickness of CD are

    6. A.
    6 cm and 1.2 mm
    B.
    6 cm and 0.6 mm
    C.
    12 cm and 0.6 mm
    D.
    12 cm and 1.2 mm

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  6. Consider the following statements about advantages of phase discriminator over slope detector

    1. Fewer tuned circuits
    2. Greater limiting
    3. Better linearity
    4. Easy alignment
    Which of the above are true?

    7. A.
    1, 2, 3, 4
    B.
    2, 3, 4
    C.
    1, 2, 3
    D.
    1, 3, 4

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  7. In a superheterodyne radio receiver

    8. A.
    RF amplifier normally operates at 455 kHz above carrier frequency
    B.
    mixer input must be tuned to the signal frequency
    C.
    local oscillator operates below signal frequency
    D.
    local oscillator frequency is double the IF

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  8. The assigned carrier frequency of an FM broadcast station is 96.3 MHz. Its FM signal has a centre frequency of

    9. A.
    10 MHz
    B.
    455 kHz
    C.
    48.15 MHz
    D.
    96.3 MHz

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  9. Digital television is also called

    10. A.
    High digital television
    B.
    High definition television
    C.
    High deflection television
    D.
    High display television

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  10. At FM demodulator output noise power density

    11. A.
    increases with frequency
    B.
    decreases with frequency
    C.
    remains unaltered
    D.
    none of the above

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